Micron has released a new firmware update for the Crucial M4 and Micron C400 SSDs. There is also a 01MG firmware for the mSATA versions of these two SSDs. Here is the change log for firmware 010G/01MG:

Version 010G includes the following changes:* Improved Trim response time* Improved power-on-to-ready time (known as POR, or TTR for Time-to-ready)* Improved resume-time from low power modes, and improved reliability of warm reboot* Improved power consumption by disabling HIPM (Host Initiated Power Management)